CN114270655A - Voltage conversion circuit, voltage conversion device, voltage conversion chip and charging equipment - Google Patents
Voltage conversion circuit, voltage conversion device, voltage conversion chip and charging equipment Download PDFInfo
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- CN114270655A CN114270655A CN202180004999.5A CN202180004999A CN114270655A CN 114270655 A CN114270655 A CN 114270655A CN 202180004999 A CN202180004999 A CN 202180004999A CN 114270655 A CN114270655 A CN 114270655A
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- 238000001914 filtration Methods 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims description 69
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- 238000010586 diagram Methods 0.000 description 19
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- 230000008878 coupling Effects 0.000 description 3
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- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
- B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
- B60L53/31—Charging columns specially adapted for electric vehicles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The embodiment of the application provides a voltage conversion circuit, voltage conversion device, voltage conversion chip and battery charging outfit, voltage conversion circuit includes: the charging device comprises a charging input interface, a charging output interface, a filtering module, a switch module and a voltage conversion module; the filtering module is used for suppressing a common-mode current signal; the switch module is used for being switched on when the voltage value of the charging input interface is not smaller than a preset voltage value and being switched off when the voltage value of the charging input interface is smaller than the preset voltage value, so that the filter module works only when the voltage value of the charging input interface is not smaller than the preset voltage value; the voltage conversion module is used for converting the input voltage value of the charging input interface into the preset voltage value and then outputting the preset voltage value through the charging output interface. Therefore, the common-mode current signal can be restrained, and the working stability and safety of a circuit system are improved.
Description
Technical Field
The application relates to the field of automobile charging, in particular to a voltage conversion circuit, a voltage conversion device, a voltage conversion chip and charging equipment.
Background
In order to increase the single-charging driving mileage of the new energy electric vehicle, most host plants select to increase the voltage of the vehicle-mounted battery pack. Therefore, the battery pack can store more energy, and the purpose of improving the driving mileage is achieved. In the current stage, the output voltage of a battery pack of an electric automobile with most single-charging NDC driving range of 400-500 KM is 300-450V. In order to increase the driving mileage of a single-charge NDC to 800-1000 KM, the output voltage of a vehicle-mounted battery pack of a new energy automobile is increased to 800V or even higher by the conventional implementation method. However, the maximum output voltage of part of the ground direct-current charging piles at the present stage is usually 500V, and the maximum output voltage of a small part of the ground direct-current charging piles is 750V. Therefore, when the later electric vehicle selects to increase the voltage of the battery pack in order to increase the driving range of the NDC, the highest output voltage of the ground direct-current rapid charging pile is lower than the voltage of the battery pack, so that the ground charging pile cannot charge the electric vehicle. At present, in order to solve the problem that the output voltage of the charging pile is lower than the voltage of the battery pack to cause the failure of charging, a primary voltage conversion device can be added between the charging pile and the battery pack. Through promoting the output voltage who fills electric pile to the voltage that is higher than the battery package to the realization is the purpose of charging for new forms of energy electric automobile. However, the operational stability and safety of the circuitry associated with the voltage step-up device are not sufficient.
Disclosure of Invention
The embodiment of the application provides a voltage conversion circuit, a voltage conversion device, a voltage conversion chip and charging equipment, so that the safety and the stability of a circuit system of an automobile during charging are improved.
In a first aspect, an embodiment of the present application provides a voltage conversion circuit, including: the charging device comprises a charging input interface, a charging output interface, a filtering module, a switch module and a voltage conversion module;
the filtering module is used for suppressing a common-mode current signal;
the switch module is used for being switched on when the voltage value of the charging input interface is not smaller than a preset voltage value and being switched off when the voltage value of the charging input interface is smaller than the preset voltage value, so that the first filtering module works only when the voltage value of the charging input interface is not smaller than the preset voltage value;
the voltage conversion module is used for converting the input voltage value of the charging input interface into the preset voltage value and then outputting the preset voltage value through the charging output interface.
Optionally, the switch module comprises a first switch and a second switch; the first end of the first switch is connected with the positive electrode of the charging input interface, the second end of the first switch is connected with the positive electrode of the charging output interface, the first end of the second switch is connected with the negative electrode of the charging input interface, and the second end of the second switch is connected with the negative electrode of the charging output interface.
Optionally, the filtration module comprises a first filter and a second filter; the first end of the first filter is connected with the charging input interface, and the second end of the first filter is connected with the first end of the voltage conversion module; the first end of the second filter is connected with the second end of the voltage conversion module, and the second end of the second filter is connected with the charging output interface.
Optionally, the first filter comprises a first positive coil and a first negative coil, and the second filter comprises a second positive coil and a second negative coil; a first end of the first positive coil is connected with a positive electrode of the charging input interface, a second end of the first positive coil is connected with a positive electrode of the first end of the voltage conversion module, a first end of the first negative coil is connected with a negative electrode of the charging input interface, and a second end of the first negative coil is connected with a negative electrode of the first end of the voltage conversion module; the first end of second positive pole coil with the anodal of the second end of voltage conversion module is connected, the second positive pole coil the second end with the anodal of the output interface that charges is connected, the first end of second negative pole coil with the negative pole of the second end of voltage conversion module is connected, the second end of second negative pole coil with the negative pole of the output interface that charges is connected.
Optionally, the first positive coil and the first negative coil have the same number of turns and same polarity, respectively, and the second positive coil and the second negative coil have the same number of turns and same polarity, respectively.
Optionally, the first filter comprises a first main capacitor and a first sub capacitor, and the second filter comprises a second main capacitor and a second sub capacitor; the positive electrode of the charging input interface is combined with the first end of the first main capacitor and then connected with the positive electrode of the first end of the voltage conversion module, the second end of the first main capacitor is combined with the second end of the first auxiliary capacitor and then grounded, and the negative electrode of the charging input interface is combined with the first end of the first auxiliary capacitor and then connected with the negative electrode of the first end of the voltage conversion module; the positive electrode of the charging output interface is connected with the positive electrode of the second end of the voltage conversion module after being combined with the first end of the second main capacitor, the second end of the second main capacitor is grounded after being combined with the second end of the second auxiliary capacitor, and the negative electrode of the charging output interface is connected with the negative electrode of the second end of the voltage conversion module after being combined with the first end of the second auxiliary capacitor.
Optionally, the first filter includes a first common-mode inductor and a first common-mode capacitor, a first end of the first common-mode capacitor is connected to the charging input interface, a second end of the first common-mode capacitor is connected to the first end of the first common-mode inductor, and a second end of the first common-mode inductor is connected to the first end of the voltage conversion module; the second filter comprises a second common-mode inductor and a second common-mode capacitor, a first end of the second common-mode inductor is connected with a second end of the voltage conversion module, a second end of the second common-mode inductor is connected with a first end of the second common-mode capacitor, and a second end of the second common-mode capacitor is connected with the charging output interface.
In a second aspect, embodiments of the present application provide a voltage conversion apparatus including a voltage conversion circuit as described in the first aspect above.
In a third aspect, an embodiment of the present application provides a voltage conversion chip, where the voltage conversion chip includes the voltage conversion circuit as described in the first aspect.
In a fourth aspect, an embodiment of the present application provides a charging device, which includes the voltage conversion circuit according to the first aspect.
It can be seen that, in the embodiment of the present application, the voltage conversion circuit includes charging input interface, charging output interface, filtering module, switch module and voltage conversion module, wherein, filtering module is used for suppressing common mode current signal, switch module is used for charging the voltage value of input interface and not being less than and switching on when predetermineeing the voltage value charging input interface's voltage value is less than break off when predetermineeing the voltage value, in order to realize filtering module only charging input interface's voltage value is not less than work when predetermineeing the voltage value, voltage conversion module be used for with charging input interface's input voltage value converts into pass through after predetermineeing the voltage value charging output interface exports. Like this, when ground fills electric pile's voltage and is less than the required voltage of battery package, promptly the voltage value of charging input interface is less than preset voltage value, uses the output voltage value of the conversion of the voltage conversion module among the voltage conversion circuit electric pile, and filter module can restrain common mode current signal, promotes circuit system's job stabilization nature. When the highest output voltage of the ground charging pile is higher than the voltage required by the battery pack, the current can not pass through the filtering module, so that the filtering module is prevented from being damaged by heating, and the safety of a circuit system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a charging system according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a voltage conversion circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a switch module of a voltage conversion circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a filter module of a voltage conversion circuit according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a filter of a voltage converting circuit according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a filter of another voltage conversion circuit provided in an embodiment of the present application;
FIG. 7 is a schematic diagram of a filter of another voltage conversion circuit provided in an embodiment of the present application;
fig. 8 is a schematic structural diagram of a voltage conversion device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a voltage conversion chip according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a charging device according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In order to better understand the technical solution of the embodiment of the present application, a voltage conversion circuit that may be involved in the embodiment of the present application will be described below.
Referring to fig. 1, fig. 1 is a schematic view of a charging system provided in an embodiment of the present application, where the charging system includes a charging pile, a voltage conversion device, and a battery pack, and the charging pile may be a ground dc charging pile for supplying power to a battery. The voltage conversion device is respectively connected with the charging pile and the battery pack, and is used for converting the output voltage of the charging pile into the voltage suitable for the battery pack, for example, the output voltage of the charging pile is 500V, and the voltage conversion device can increase the voltage of 500V to 800V, wherein the voltage conversion device is a device converting direct current into direct current. The battery pack is used for storing the acquired electric energy and supplying power to the automobile. The voltage conversion device can be integrated on the automobile together with the battery pack, the voltage conversion device can also be an independent detachable device, and the voltage conversion device can also be integrated in the charging pile.
At present, in order to increase the driving mileage of automobiles, most automobile manufacturers increase the output voltage of the battery pack of the automobile from 300-450V to 800V or even higher, and the national and even global infrastructure engineering of the charging piles of electric automobiles is slow, so that the maximum output voltage of most charging piles is still lower than the voltage of the current battery pack. Therefore, when the automobile is charged, two modes may appear, one is the bypass mode when the voltage of charging pile is higher than or equal to the voltage of battery package, and the other is the boost mode when the voltage of charging pile is lower than the voltage of battery package. The voltage conversion device often adds a filter module for suppressing a common mode current signal, but the rated current of the filter module in the boost mode is different from the rated current in the bypass mode, so that the situation that the filter module is heated and damaged may occur in the voltage conversion device in a certain mode, and the safety of a circuit system cannot be guaranteed.
In conjunction with the above description, the voltage conversion circuit will be described below according to an embodiment. Referring to fig. 2, fig. 2 is a block diagram of a voltage converting circuit according to an embodiment of the present disclosure.
The voltage conversion circuit comprises a charging input interface 210, a charging output interface 250, a filtering module 220, a switch module 230 and a voltage conversion module 240; wherein the filtering module 220 is configured to suppress the common mode current signal; the switch module 230 is configured to be turned on when the voltage value of the charging input interface is not less than a preset voltage value, and turned off when the voltage value of the charging input interface 210 is less than the preset voltage value, so that the filtering module 220 only works when the voltage value of the charging input interface 210 is not less than the preset voltage value; the voltage conversion module 240 is configured to convert the input voltage value of the charging input interface 210 into the preset voltage value and output the preset voltage value through the charging output interface 250.
The common mode current signal refers to current signals generated in the circuit system, which are not necessarily equal in magnitude but same in direction or phase. The common-mode current signal can generate common-mode interference in the circuit system, the common-mode interference refers to interference of two signal lines to the ground, and the common-mode interference is called if the environment generates interference (overlapping the same voltage) with the same amplitude to the ground between the two signal lines. The common mode interference may cause a certain damage to the circuit system, so that the circuit system cannot work normally. When an automobile is charged, the high-frequency switching operation of the power conversion device may cause an electromagnetic Interference (EMI) problem, which affects the operating stability of the circuit system, and therefore, a filtering module needs to be added to the voltage conversion circuit to suppress the EMI common mode Interference.
In a specific implementation, the switch module 230 is connected to the charging input interface 210 and the charging output interface 250, respectively, so that the switch module 230 can control whether the voltage conversion module 240 operates. That is, in the boost mode, the switch module 230 is in the off state, and the voltage conversion module 240 is in operation at this time, and in the bypass mode, the switch module 230 is in the on state, and the voltage conversion module 240 is in the off state at this time. It is possible to prevent the filter module 220 from being damaged due to heat generated by the current passing through the filter module 220.
It can be seen that, in this example, the voltage conversion circuit includes a charging input interface, a charging output interface, a filtering module, a switch module and a voltage conversion module, wherein, the filtering module is used for suppressing the common mode current signal, the switch module is used for switching on when the voltage value of the charging input interface is not less than the preset voltage value, and switching off when the voltage value of the charging input interface is less than the preset voltage value, so as to realize that the filtering module is only in when the voltage value of the charging input interface is not less than the preset voltage value, the voltage conversion module is used for converting the input voltage value of the charging input interface into the preset voltage value and then outputting through the charging output interface. Like this, when ground fills electric pile's voltage and is less than the required voltage of battery package, promptly the voltage value of charging input interface is less than preset voltage value, uses the output voltage value of the conversion of the voltage conversion module among the voltage conversion circuit electric pile, and filter module can restrain common mode current signal, promotes circuit system's job stabilization nature. When the highest output voltage of the ground charging pile is higher than the voltage required by the battery pack, the current can not pass through the filtering module, so that the filtering module is prevented from being damaged by heating, and the safety of a circuit system is improved.
In one possible example, the switch module comprises a first switch K1 and a second switch K2; a first terminal of the first switch K1 is connected to the positive electrode of the charging input interface 210, a second terminal of the first switch K1 is connected to the positive electrode of the charging output interface 250, a first terminal of the second switch K2 is connected to the negative electrode of the charging input interface 210, and a second terminal of the second switch K2 is connected to the negative electrode of the charging output interface 250.
Referring to fig. 3, fig. 3 is a schematic diagram of a switch module of a voltage conversion circuit according to an embodiment of the present disclosure. As shown, the switch module includes a first switch K1 and a second switch K2, the first switch K1 and the second switch K2 are simultaneously turned off when the circuit operates in the boost mode, and the first switch K1 and the second switch K2 are simultaneously turned on when the circuit operates in the bypass mode. The first switch K1 and the second switch K2 may be a first contactor and a second contactor, respectively. Since the charging input interface 210 includes a positive input terminal and a negative input terminal, and the charging output interface also includes a negative output terminal and a positive output terminal, when the circuit operates in the bypass mode, the voltage conversion module 240 needs to be disabled, so that the voltage conversion device 240 needs to be in an open circuit state. If only one switch is provided in the switch module, only the positive electrodes of the charging input interface 210 and the charging output interface 250 can be bypassed or the negative electrodes can be bypassed, so that the positive electrode current or the negative electrode current at the non-bypassed side still passes through the filter module 220, and because the positive electrode current and the negative electrode current are not equal, a large electromagnetic field is generated in the filter module 220, and the filter module 220 is heated or even damaged in severe cases.
Therefore, in this example, the switch module simultaneously includes two switches respectively connected with the positive and negative electrodes of the charging input and output interface, so that when the circuit works in the bypass mode, the positive and negative electrodes of the filtering module can be synchronously bypassed, and the filtering module is prevented from being damaged due to heating caused by the passing of current through the filtering module.
In one possible example, the filtering module comprises a first filter 221 and a second filter 222; a first end of the first filter 221 is connected to the charging input interface 210, and a second end of the first filter 221 is connected to a first end of the voltage conversion module 240; a first end of the second filter 222 is connected to a second end of the voltage conversion module 240, and a second end of the second filter 222 is connected to the charging output interface 250.
Referring to fig. 4, fig. 4 is a schematic diagram of a filter module of a voltage conversion circuit according to an embodiment of the present disclosure. As shown, a first filter 221 is connected between the charging input interface 210 and the voltage conversion module 240, and a second filter 222 is connected between the charging output interface 250 and the voltage conversion module 240, so that the common mode EMI interference generated at the time of current input and at the time of current output can be suppressed.
In a specific implementation, a first isolated current sensor and a first isolated voltage sensor may be further connected between the first filter 221 and the voltage conversion module 240, the first isolated current sensor and the first isolated voltage sensor are connected in parallel, a second isolated current sensor and a second isolated voltage sensor may also be connected between the second filter 222 and the voltage conversion module 240, and the second isolated current sensor and the second isolated voltage sensor are connected in parallel.
Therefore, in this example, the filtering module includes two filters, and can suppress the common-mode current signal, so as to achieve the purpose of suppressing the common-mode interference and improve the working stability of the circuit system.
In one possible example, the first filter 221 includes a first positive coil L1 and a first negative coil L2, and the second filter 222 includes a second positive coil L3 and a second negative coil L4; a first end of the first positive coil L1 is connected to a positive electrode of the charging input interface, a second end of the first positive coil L1 is connected to a positive electrode of the first end of the voltage conversion module 240, a first end of the first negative coil L2 is connected to a negative electrode of the charging input interface, and a second end of the first negative coil L2 is connected to a negative electrode of the first end of the voltage conversion module 240; a first end of the second positive coil L3 is connected to a positive electrode of the second end of the voltage conversion module 240, a second end of the second positive coil L3 is connected to a positive electrode of the charging output interface, a first end of the second negative coil L4 is connected to a negative electrode of the second end of the voltage conversion module 240, and a second end of the second negative coil L4 is connected to a negative electrode of the charging output interface.
Referring to fig. 5, fig. 5 is a schematic diagram of a filter of a voltage conversion circuit according to an embodiment of the present disclosure. As shown in the figure, the Vin terminal is a charging input interface of the voltage conversion circuit, the Vout terminal is a charging output interface of the voltage conversion circuit, and K1 and K2 are a first switch and a second switch in the switch module, respectively. The filter consists of two coils which are respectively connected with the positive electrode and the negative electrode of the charging input and output interface. When the circuit works in the boosting mode, current flows through the first positive coil L1, the first negative coil L2, the second positive coil L3 and the second negative coil L4 respectively, and at this time, because of the current, the four coils generate magnetic fields respectively, so that a magnetic field which is mutually counteracted can be generated between the first positive coil and the first negative coil, and a magnetic field which is mutually counteracted can be generated between the second positive coil and the second negative coil, so that a common-mode current signal is suppressed. The first and second filters may be first and second common mode chokes.
Therefore, in this example, the filter includes two coils respectively connected to the charging input and output interfaces, so that when the circuit operates in the boost mode, a magnetic field capable of canceling each other may be generated between the positive electrode and the negative electrode, so as to suppress the common-mode current signal, thereby suppressing the EMI common-mode interference and providing the operating stability of the circuit system.
In one possible example, the first positive coil and the first negative coil have the same number of turns and the same winding direction, and the second positive coil and the second negative coil have the same number of turns and the same winding direction.
As shown in fig. 5, when the number of turns of the first positive coil L1 and the number of turns of the first negative coil L2 are equal, the winding direction is the same, the number of turns of the second positive coil L3 and the number of turns of the second positive coil L4 are equal, and the winding direction is the same, it means that when currents of positive and negative electrodes of the charging output interface and the charging input interface are equal, the magnitudes of magnetic fields generated by L1 and L2 are the same and opposite, the magnitudes of magnetic fields generated by L3 and L4 are the same and opposite, at this time, the magnetic fields generated by the coils respectively cancel each other, and the magnetic core of the wound coil in the filter does not suppress the current, at this time, the filter only suppresses the common mode current signal.
Therefore, in this example, the filter includes two coils with the same number of turns and the same polarity, so that when the circuit operates in the boost mode, the common-mode current signal is suppressed, the purpose of suppressing the EMI common-mode interference is achieved, and the operating stability of the circuit system can be improved.
In one possible example, the first filter 221 comprises a first main capacitor C1 and a first sub capacitor C2, and the second filter 222 comprises a second main capacitor C3 and a second sub capacitor C4; the positive electrode of the charging input interface is combined with the first end of the first main capacitor C1 and then connected to the positive electrode of the first end of the voltage conversion module 240, the second end of the first main capacitor C1 is combined with the second end of the first auxiliary capacitor C2 and then grounded, and the negative electrode of the charging input interface is combined with the first end of the first auxiliary capacitor C2 and then connected to the negative electrode of the first end of the voltage conversion module 240; the positive electrode of the charging output interface is combined with the first end of the second main capacitor C3 and then connected to the positive electrode of the second end of the voltage conversion module 240, the second end of the second main capacitor C3 is combined with the second end of the second auxiliary capacitor C4 and then grounded, and the negative electrode of the charging output interface is combined with the first end of the second auxiliary capacitor C4 and then connected to the negative electrode of the second end of the voltage conversion module 240.
Referring to fig. 6, fig. 6 is a schematic diagram of another filter of a voltage conversion circuit according to an embodiment of the present disclosure. As shown, Vin terminal in the figure is a charging output interface, Vout is a charging input interface, and K1 and K2 are the first switch and the second switch of the switch module, respectively. The mutually connected ends of the main capacitor and the auxiliary capacitor are grounded, so that the current flowing from the positive terminal and the negative terminal to the line of the grounding terminal is changed, and the common-mode current signal is directly short-circuited to the ground, thereby inhibiting the common-mode current signal.
Therefore, in this example, the filter module has a main capacitor and an auxiliary capacitor, so that when the circuit operates in the boost mode, the common-mode current signal is directly shorted to the ground, and the filter can suppress the common-mode current signal, thereby achieving the purpose of suppressing the EMI common-mode interference and improving the operating stability of the circuit system.
In one possible example, the first filter 221 includes a first common mode capacitor 2210 and a first common mode inductor 2211, a first end of the first common mode capacitor 2210 is connected with the charging input interface, a second end of the first common mode capacitor 2210 is connected with a first end of the first common mode inductor 2211, and a second end of the first common mode inductor 2211 is connected with a first end of the voltage conversion module 240; the second filter 222 includes a second common-mode inductor 2220 and a second common-mode capacitor 2221, a first end of the second common-mode inductor 2220 is connected to a second end of the voltage conversion module 240, a second end of the second common-mode inductor 2220 is connected to a first end of the second common-mode capacitor 2221, and a second end of the second common-mode capacitor 2221 is connected to the charging output interface.
As shown in fig. 7, fig. 7 is a schematic diagram of another filter of a voltage conversion circuit according to an embodiment of the present application. As shown, the first common mode inductance 2211 includes two coils, which may be the same as L1 and L2 as shown in fig. 5, i.e., the first common mode inductance 2211 may be the first filter 221 as shown in fig. 5. The first common mode capacitance 2210 comprises two capacitances, which may be the same as C1 and C2 as shown in fig. 6, i.e. the first common mode capacitance 2210 may be the first filter 221 as shown in fig. 6. The second common mode inductor and the second common mode capacitor are similar, and are not described herein again.
Therefore, the connection relationship of the voltage conversion circuit may be: the first end of the first main capacitor is combined with the first end of the first positive coil and then connected with the positive electrode of the charging input interface, the second end of the first positive coil is connected with the positive electrode of the first end of the voltage conversion module, the first end of the first auxiliary capacitor is combined with the first end of the first negative coil and then connected with the negative electrode of the charging input interface, the second end of the first negative coil is connected with the negative electrode of the first end of the voltage conversion module, and the second end of the first main capacitor is combined with the second end of the first auxiliary capacitor and then grounded; the first end of the second positive coil is connected with the positive electrode of the second end of the voltage conversion module, the second end of the second positive coil is combined with the first end of the second main capacitor and then connected with the positive electrode of the charging output interface, the first end of the second negative coil is connected with the negative electrode of the second end of the voltage conversion module, the second end of the second negative coil is combined with the second end of the second auxiliary capacitor and then connected with the negative electrode of the charging output interface, and the second end of the second main capacitor is combined with the second end of the second auxiliary capacitor and then grounded. Because the first positive coil and the first negative coil are wound on one ferrite magnetic ring at the same time, and the effect of the ferrite magnetic ring depends on the impedance of the original common-mode loop, the lower the impedance of the original loop is, the more obvious the effect of the ferrite magnetic ring is, and the common-mode inductor and the common-mode capacitor which are simultaneously included in the filter module can reduce the impedance of the loop, so that the suppression effect on the common-mode current is better.
Therefore, in this embodiment, the common-mode inductor is connected with a common-mode capacitor, so that the suppression effect of the filter on common-mode current signals can be enhanced.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a voltage conversion device according to an embodiment of the present disclosure. As shown in fig. 8, the voltage conversion apparatus 800 may include any one of the voltage conversion circuits shown in fig. 2 to 7. The voltage conversion device can be integrated in a vehicle or in a charging pile, and can also be an independent device.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a voltage conversion chip according to an embodiment of the present disclosure, and as shown in fig. 9, the voltage conversion chip 900 may include any one of the voltage conversion circuits shown in fig. 2 to fig. 7.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a charging device according to an embodiment of the present disclosure, and as shown in fig. 10, the charging device 10 may include any one of the voltage conversion circuits shown in fig. 2 to fig. 7. The charging equipment can be the charging equipment positioned on the automobile, can also be the charging equipment positioned on the charging pile, and can also be independent charging equipment.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the above-described modules is merely a logical division, and an actual implementation may have another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The embodiments of the present invention have been described in detail, and the principles and embodiments of the present invention are explained herein by using specific embodiments, which are merely used to help understand the present invention and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A voltage conversion circuit, comprising: the charging device comprises a charging input interface, a charging output interface, a filtering module, a switch module and a voltage conversion module;
the filtering module is used for suppressing a common-mode current signal;
the switch module is used for being switched on when the voltage value of the charging input interface is not smaller than a preset voltage value and being switched off when the voltage value of the charging input interface is smaller than the preset voltage value, so that the filter module works only when the voltage value of the charging input interface is not smaller than the preset voltage value;
the voltage conversion module is used for converting the input voltage value of the charging input interface into the preset voltage value and then outputting the preset voltage value through the charging output interface.
2. The circuit of claim 1, wherein the switch module comprises a first switch and a second switch;
the first end of the first switch is connected with the positive electrode of the charging input interface, the second end of the first switch is connected with the positive electrode of the charging output interface, the first end of the second switch is connected with the negative electrode of the charging input interface, and the second end of the second switch is connected with the negative electrode of the charging output interface.
3. The circuit of claim 2, wherein the filtering module comprises a first filter and a second filter;
the first end of the first filter is connected with the charging input interface, and the second end of the first filter is connected with the first end of the voltage conversion module;
the first end of the second filter is connected with the second end of the voltage conversion module, and the second end of the second filter is connected with the charging output interface.
4. The circuit of claim 3, wherein the first filter comprises a first positive coil and a first negative coil, and the second filter comprises a second positive coil and a second negative coil;
a first end of the first positive coil is connected with a positive electrode of the charging input interface, a second end of the first positive coil is connected with a positive electrode of the first end of the voltage conversion module, a first end of the first negative coil is connected with a negative electrode of the charging input interface, and a second end of the first negative coil is connected with a negative electrode of the first end of the voltage conversion module;
the first end of second positive pole coil with the anodal of the second end of voltage conversion module is connected, the second positive pole coil the second end with the anodal of the output interface that charges is connected, the first end of second negative pole coil with the negative pole of the second end of voltage conversion module is connected, the second end of second negative pole coil with the negative pole of the output interface that charges is connected.
5. The circuit of claim 4, wherein the first positive coil and the first negative coil have the same number of turns and the same winding direction, and the second positive coil and the second negative coil have the same number of turns and the same winding direction.
6. The circuit of claim 3, wherein the first filter comprises a first primary capacitor and a first secondary capacitor, and the second filter comprises a second primary capacitor and a second secondary capacitor;
the positive electrode of the charging input interface is combined with the first end of the first main capacitor and then connected with the positive electrode of the first end of the voltage conversion module, the second end of the first main capacitor is combined with the second end of the first auxiliary capacitor and then grounded, and the negative electrode of the charging input interface is combined with the first end of the first auxiliary capacitor and then connected with the negative electrode of the first end of the voltage conversion module;
the positive electrode of the charging output interface is connected with the positive electrode of the second end of the voltage conversion module after being combined with the first end of the second main capacitor, the second end of the second main capacitor is grounded after being combined with the second end of the second auxiliary capacitor, and the negative electrode of the charging output interface is connected with the negative electrode of the second end of the voltage conversion module after being combined with the first end of the second auxiliary capacitor.
7. The circuit of claim 3, wherein the first filter comprises a first common-mode inductor and a first common-mode capacitor, a first terminal of the first common-mode capacitor is connected to the charging input interface, a second terminal of the first common-mode capacitor is connected to a first terminal of the first common-mode inductor, and a second terminal of the first common-mode inductor is connected to a first terminal of the voltage conversion module;
the second filter comprises a second common-mode inductor and a second common-mode capacitor, a first end of the second common-mode inductor is connected with a second end of the voltage conversion module, a second end of the second common-mode inductor is connected with a first end of the second common-mode capacitor, and a second end of the second common-mode capacitor is connected with the charging output interface.
8. A voltage conversion device, characterized in that the voltage conversion device comprises a power conversion circuit according to any one of claims 1-7.
9. A voltage conversion chip characterized in that it comprises a voltage conversion circuit according to any one of claims 1 to 7.
10. A charging device characterized in that it comprises a voltage conversion circuit according to any one of claims 1 to 7.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2021/087947 WO2022217619A1 (en) | 2021-04-17 | 2021-04-17 | Voltage conversion circuit, voltage conversion apparatus, voltage conversion chip and charging device |
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| CN114270655A true CN114270655A (en) | 2022-04-01 |
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| CN202180004999.5A Pending CN114270655A (en) | 2021-04-17 | 2021-04-17 | Voltage conversion circuit, voltage conversion device, voltage conversion chip and charging equipment |
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| WO (1) | WO2022217619A1 (en) |
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| WO2022217619A1 (en) | 2022-10-20 |
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